In a large project I found out that after on resizing of the form, some
components get properly resized but don't receive an Invalidate call. I
guess, it's caused by the test in lcl/include/control.inc
if not ((csLoading in ComponentState) or (Self is TWinControl)) then
InvalidateControl(IsControlVisible, False, true);
Our component extends TCustomControl, so it doesn't get invalidated. I
guess, such components are supposed to use a different mechanism, but I
can't see how? Can someone point me to the right doc.
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